2-Diazo-malonic acid (Z)-1-benzyloxy-5-phenylsulfanyl-pent-3-enyl ester ethyl ester 在
dirhodium tetraacetate 作用下,
以
苯 为溶剂,
生成 (3S,4S,6R)-6-Benzyloxy-2-oxo-3-phenylsulfanyl-4-vinyl-tetrahydro-pyran-3-carboxylic acid ethyl ester 、 (3S,4S,6S)-6-Benzyloxy-2-oxo-3-phenylsulfanyl-4-vinyl-tetrahydro-pyran-3-carboxylic acid ethyl ester